/*
Error: Undefined mixin 'com'.
        on line 18 of scss/nex3.scss, in `com'
        from line 18 of scss/nex3.scss

13: 
14: .tuopis {
15:     text-align: center;
16:     top: r(40px);
17:     left: r(60px);
18:     @include com;
19:       input {
20:         background: #8d2bcc;
21:     }
22: }
23: 

Backtrace:
scss/nex3.scss:18:in `com'
scss/nex3.scss:18
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:348:in `block in visit_mixin'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/stack.rb:98:in `block in with_mixin'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/stack.rb:135:in `with_frame'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/stack.rb:98:in `with_mixin'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:346:in `visit_mixin'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/base.rb:36:in `visit'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:158:in `block in visit'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/stack.rb:79:in `block in with_base'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/stack.rb:135:in `with_frame'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/stack.rb:79:in `with_base'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:158:in `visit'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:440:in `block (2 levels) in visit_rule'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:440:in `map'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:440:in `block in visit_rule'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:179:in `with_environment'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:438:in `visit_rule'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/base.rb:36:in `visit'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:158:in `block in visit'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/stack.rb:79:in `block in with_base'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/stack.rb:135:in `with_frame'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/stack.rb:79:in `with_base'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:158:in `visit'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/base.rb:52:in `block in visit_children'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/base.rb:52:in `map'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/base.rb:52:in `visit_children'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:167:in `block in visit_children'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:179:in `with_environment'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:166:in `visit_children'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/base.rb:36:in `block in visit'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:186:in `visit_root'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/base.rb:36:in `visit'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:157:in `visit'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:10:in `visit'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/root_node.rb:36:in `css_tree'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/tree/root_node.rb:29:in `render_with_sourcemap'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/engine.rb:389:in `_render_with_sourcemap'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/engine.rb:307:in `render_with_sourcemap'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/plugin/compiler.rb:462:in `update_stylesheet'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/plugin/compiler.rb:215:in `block in update_stylesheets'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/plugin/compiler.rb:209:in `each'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/plugin/compiler.rb:209:in `update_stylesheets'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/plugin/compiler.rb:443:in `on_file_changed'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-3.7.2/lib/sass/plugin/compiler.rb:320:in `block in watch'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-listen-4.0.0/lib/sass-listen/event/config.rb:23:in `call'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-listen-4.0.0/lib/sass-listen/event/processor.rb:115:in `_process_changes'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-listen-4.0.0/lib/sass-listen/event/processor.rb:19:in `block in loop_for'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-listen-4.0.0/lib/sass-listen/event/processor.rb:15:in `loop'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-listen-4.0.0/lib/sass-listen/event/processor.rb:15:in `loop_for'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-listen-4.0.0/lib/sass-listen/event/loop.rb:84:in `_wait_for_changes'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-listen-4.0.0/lib/sass-listen/event/loop.rb:42:in `block in setup'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sass-listen-4.0.0/lib/sass-listen/internals/thread_pool.rb:6:in `block in add'
*/
body:before {
  white-space: pre;
  font-family: monospace;
  content: "Error: Undefined mixin 'com'.\A         on line 18 of scss/nex3.scss, in `com'\A         from line 18 of scss/nex3.scss\A \A 13: \A 14: .tuopis {\A 15:     text-align: center;\A 16:     top: r(40px);\A 17:     left: r(60px);\A 18:     @include com;\A 19:       input {\A 20:         background: #8d2bcc;\A 21:     }\A 22: }\A 23: "; }
